diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index 1e0ed7336cfb..2fea1b29a434 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -1916,7 +1916,7 @@ class StopIteration(Exception):
     value: Any
 
 class OSError(Exception):
-    errno: int
+    errno: int | None
     strerror: str
     # filename, filename2 are actually str | bytes | None
     filename: Any